CONTENTS 



IX 



PAGE 



tion of water supply Sand filtration Small filters 

 Water as a beverage Cambric tea Cocoa and chocolate 

 Tea and coffee Dangers of tea and coffee Alcohol 

 Oxidation of alcohol Dangers of alcohol 8T 



CHAPTER X 



DIGESTION 



Simplest form of digestion More complex forms Mouth 

 Teeth Permanent set Development of teeth Roots 

 Structure Tongue Cheeks Salivary glands Saliva 

 Pharynx Esophagus Stomach Gastric . juice Exit of 

 chyme from the stomach Rejection of food Small in- 

 testine Liver Pancreas Digestion of fat Chyle 

 Villi Absorption of food Food after absorption Un- 

 digested residue Large intestine 96 



CHAPTER XI 



THE HYGIENE OF DIGESTION 



Food in relation to age To health To activity Variations 

 in diet Times for meals Appetite as a guide Its 

 unreliability Composition of food Necessity for vari- 

 ety Importance of good teeth 120 



CHAPTER XII 



THE BLOOD 



Red blood corpuscles White blood corpuscles Platelets 

 Plasma Fibrin Blood as a common carrier Blood 

 changes Food elements Carbohydrates Hydrocarbons 

 Proteids Water Storage of excess food Starvation 

 Internal secretions of glands Spleen 126 



CHAPTER XIII 



THE CIRCULATION OF THE BLOOD 



System of tubes for the blood Greater and lesser circuits 

 Heart Heart muscle Muscle cells Ventricles Auri- 

 cles Auriculo-ventricular valves Exit valves from ven- 

 tricles Arteries Functions of arteries Structure of 

 arterial wall Control of blood supply Branching of 

 arteries Capillaries Veins Blood flow in the veins 

 General function of blood-vessels Pulmonary circula- 

 tion Travels of a drop of blood Lymphatics Function 

 of lymphatic system Lymph glands Control of blood 

 supply to tissues 135 



